package com.wengzw.interceptor;

import com.wengzw.po.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
       //获取请求的url
        String uri = httpServletRequest.getRequestURI();
        System.out.print(uri);
        //返回指定字符在字符串中第一次出现处的索引，如果此字符串中没有这样的字符，则返回 -1
        if(uri.indexOf("/login")>=0){
            return true;
        }
       //获取session
        HttpSession session = httpServletRequest.getSession();
       User user = (User) session.getAttribute("user_session");
       if(user != null){
           return true;
       }
       else{
           httpServletRequest.setAttribute("msg","您还没登，请先登陆");
           httpServletRequest.getRequestDispatcher("login.jsp").forward(httpServletRequest,httpServletResponse);
           return false;
       }
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}
